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In this study, new PVC (polyvinyl chloride) polymers doped with different contents of basalt nanoparticles have been prepared. The PVC was mixed with concentrations (0, 5, 10, 15, 20, and 50 wt%) of basalt nanoparticles utilizing the casting method. The samples coded as PB0.0, PB5.0, PB10.0, PB15.0, PB20.0, and PB50.0. The density of the casted samples increased from 1.38 to 2.18 g/cm3 with increasing basalt nanoparticle concentrations. Scanning electron microscope (SEM) of the prepared samples showed a good dispersion with small basalt concentrations in the while some agglomerations were found with the highest basalt concentrations in the mixture. The values of the direct optical energy gap varied from 3.0 to 3.5 eV, while the refractive index values changed from 2.39 to 2.27. The gamma-ray shielding parameters were evaluated using the Phy-X/PSD software program as well as the MCNP – code. The most critical results showed that the linear-attenuation coefficient (μ) increased from 14.421 to 23.862 cm−1 (at 0.015 MeV), and from 0.030 to 0.048 cm−1 (at 15 MeV) for PB0.0 and PB50.0 samples, respectively. Moreover, the evaluation of other gamma - ray shielding characteristics showed an enhancement with the addition of the basalt nanoparticles. Besides, neutron cross section was also calculated, and results revealed that PB0.0 is 0.086 cm−1 and PB50.0 is 0.104 cm−1. Finally, the obtained results concluded that the γ -ray, and neutron shielding capacities were enhanced with the increase in basalt nanocomposites amount in the fabricated composites. • New polymeric materials based on PVC doped with basalt were prepared. • TEM proved that the used materials are Nano composites. • The radiation shielding capacity of the prepared samples has been investigated through Phy-X and MCNP code. • Optical band gap and refractive index were calculated. [ABSTRACT FROM AUTHOR]